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Home / DTC / B297C — Trunklid cylinder open:CLS cycle

B297C — Trunklid cylinder open:CLS cycle

Detailed page for trouble code B297C.

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Code

B297C

MITSUBISHI B — Body

Trunklid cylinder open:CLS cycle

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty trunk lid cylinder/actuator open sensor (switch)
  • Damaged or shorted wiring or connector between sensor and BCM
  • Corroded or loose connector terminals at sensor or BCM
  • Mechanical binding or obstruction preventing cylinder from fully closing
  • Faulty trunk actuator/cylinder (hydraulic/pneumatic/electric)
  • Intermittent BCM input or BCM software/firmware fault

Symptoms

  • Trunk will not complete close cycle or reopens unexpectedly
  • Trunk open/close warning message or lamp illuminated on dash
  • Trunk close operation stops partway or feels abnormal (binding, grinding)
  • DTC B297C stored in BCM with possible related body module codes
  • Inconsistent switch reading when operating trunk manually

What to check

  • Read and record stored DTCs and freeze frame data with a suitable scan tool
  • Attempt trunk close cycle while observing behaviour and listening for actuator noise
  • Visually inspect trunk cylinder/actuator, latch, striker, and surrounding hardware for damage, blockage, or misalignment
  • Inspect wiring harness through hinge area for chafing, broken wires, or pinched sections
  • Check connectors for corrosion, bent pins, water ingress, or poor engagement
  • Perform manual open/close of trunk while watching switch/connector to reproduce fault

Signal parameters

  • Open/closed sensor continuity: closed ≈ near 0 Ω (continuity), open = open circuit/OL
  • Expected sensor voltage: typical pull-up to battery or 5 V — closed switches usually pull input to ground or low; open returns to pull-up voltage (measure with reference to body ground)
  • Actuator current draw: during operation expect increased current (vehicle-specific); abrupt zero or very high current may indicate open circuit or short/lock-up
  • CAN/communication: trunk module/BCM should report trunk position messages on vehicle bus during cycle (scan-tool live data)
  • Switch debounce: the trunk position input should be stable (no rapid toggling) during travel

Diagnostic algorithm

  1. Connect a dealer-level or OEM-capable scan tool, read and log DTCs and freeze frame; note whether code is current or historic
  2. Attempt one close cycle while monitoring trunk position input/state live data on the scan tool. Reproduce the fault if possible
  3. Perform a visual inspection of the trunk cylinder/actuator, latch, striker, and surrounding areas for mechanical obstruction, misadjustment, broken components, or foreign objects. Adjust latch alignment per service manual if needed
  4. With trunk in known open/closed positions, inspect and wiggle the wiring harness through the hinge area while monitoring live data or using an ohmmeter to check for intermittent opens/shorts
  5. Disconnect connector at trunk cylinder/sensor. Inspect pins for corrosion or damage. With ignition ON, measure voltage at the sensor connector reference pin(s) to vehicle ground to confirm expected pull-up or supply voltage
  6. Check sensor switch continuity with multimeter while manually actuating switch: closed should show continuity (low ohms), open should show high resistance/OL. Replace sensor if readings are outside expected behaviour
  7. If wiring and switch are good, check actuator power and ground during an active cycle: measure supply voltage and use a clamp meter to verify expected current draw or compare to service specifications
  8. If wiring and actuator test okay, consider replacing trunk cylinder/actuator assembly or sensor per service information. Reconnect and clear codes, then re-test multiple open/close cycles to confirm repair
  9. If problems persist and all hardware checks good, inspect BCM inputs and grounds, check for software updates/module reprogramming, and evaluate module replacement only after exhausting wiring and mechanical causes

Likely causes

  • Failed or misadjusted trunk open/close position switch
  • Wiring harness damaged at trunk hinge/striker area
  • Connector corrosion or bent pins at trunk cylinder assembly
  • Mechanical obstruction or worn latch preventing full travel

Fault status

⚠️ Status
Body control module stored B297C: trunk lid cylinder reported open (unexpected) during close (CLS) cycle. Check trunk sensor, wiring and mechanism.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B297A B297B B297D B2980 B2A00
406

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